Transcoder and Rate Adaptation Unit, or TRAU, performs transcoding function for speech channels and RA (Rate Adaptation) for data channels in the GSM network. The Transcoder/Rate Adaptation Unit (TRAU) is the data rate conversion unit. The PSTN/ISDN switch is a switch for 64 kbit/s voice. Current technology permits to decrease the bit-rate (in GSM...
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http://en.wikipedia.org/wiki/TRAU
Transcoding Rate and Adaptation Unit.
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http://www.encyclo.co.uk/visitor-contributions.php
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